Kospi drops sharply on global market slump   •   Sheffield Green seeks wind power maintenance acquisitions   •   Trump says US takes control of Venezuelan oil reserves   •   Japan tightens rules on long-term mortgages   •   Singapore shares slide 0.7 percent on Thursday   •   Kospi drops sharply on global market slump   •   Sheffield Green seeks wind power maintenance acquisitions   •   Trump says US takes control of Venezuelan oil reserves   •   Japan tightens rules on long-term mortgages   •   Singapore shares slide 0.7 percent on Thursday   •